Disk-sharpener.



No. 731,263. PATENTED JUNE 16, 1903. T. M. ANDERSON.

DIS K SHARPENER.

APPLICATION FILED DEC. 4. 1902.

/ R0 MODEL.

l llllll ll llllm 1 UNITED STATES Patented June 16, 1903.

PATENT OF ICE.

TOBIAS MATTIAS ANDERSON, OF ALTON, ILLINOIS, ASSIGNOR TO HAPGOOD PLOW COMPANY, OF ALTON, ILLINOIS, A CORPORATION OF ILLINOIS.

DISK SHARPENER.

BPEGIFICATION forming part of Letters Patent No. 731,263, dated June 16, 1903 Application filed December 4:, 1902. Serial No. 133,931. (No model.) 7

1'0 all whmn it may OOH/8677b.

Be it known that I, ToBIAs MArrrAs ANDER- SON, a citizen of the United States, residing at Alton, in the county of Madison and State of Illinois, have invented certain new and useful Improvements in Disk-Sharpeners, of which the following is a specification.

The object of my invention is to provide simple and efficient means for sharpening IO metal disks, such as those used in harrows, cultivators, plows, &c. Heretofore these have usually been sharpened by grindingmachines; but this results in a waste of material and special and expensive mechanism is required for producing a true and even edge. These disks have sometimes been sharpened by having their edges forged; but no special means has been devised prior to my invention, so far as I am aware, for enabling such disks to be sharpened in this way in such manner as to preserve a true alinement of the cutting edge.

In carrying out my invention I provide a metal block with a convex surface and having 2 5 devices for attaching it to ordinary blacksmiths anvils of different sizes, and to this block I attach a skeleton frame conforming in general outline to the concave contour of the disks to be sharpened. The central portion of this frame is provided with an aperture through which extends a rod that may be turned in said aperture as the operation of sharpening progresses. Devices are carried by the rod for firmly attaching the disks to it in such manner as to hold a portion of the edge of the disk on the convex surface of the block, where it may be forged, the disk being turned about its axis as the forging progresses. In the accompanying drawings, Figure l is a perspective view of an ordinary blacksmiths anvil with my improvements applied, a disk being shown in proper position to be sharpened. Fig. 2 is a detail view in section of the same detached from the anvil. Fig. 3 5 is a perspective view of the same with the disk omitted.

The anvil A may be of any usual construction, my attachment being adapted to be applied to different sizes of all the usual kinds of anvils. The block B is of metal hardened throughout or at least 011 its upper convex side I). At the bottom the block is formed with flanges c, carrying set-screws d, by means of which the block may be firmly attached to the anvil in the manner shown in Fig. 1. At one end the block is formed with a lug e, to which is attached a supporting-frame H for the disk O. This frame is shown as consisting of a plate D, attached at its inner end to the lug e and at its outer end carrying three radial arms E, that may be riveted or bolted to the plate in the manner indicated. The plate and the arms are curved in such manner as to conform to the general shape of the disk, the outer ends of the arms being arranged to bear against the disk near its outer edge and to thus hold it true and even with one portion resting on the curved or convex top of the block B. It will be observed that the top of the block is curved in such manner as to conform to the shape of the disk, and thus afford a firm and steady support therefor under that portion being forged at any time.

The plate D is formed with an aperture through which extends a rod F, having a tapered lower end f and provided at its upper end with a cross-bar or handle g. A short distance from its lower end the rod is provided with a collar h, which is preferably beveled, as shown, and which limits the movement of the rod when its lower end is inserted in the aperture iii-the plate D. A short'distance above this collar the rod is formed with a slot to receive a cotter-pin or key z'. This pin bears against a loose washer j, arranged between the slot and the'collar.

The disk O is attached to the rod F by first removing the cross-bar g,the cotter-pin 'L, and the washer j and then passing the rod through the central opening in the disk. Then the washer is dropped into place on the rod and the pin 1} is driven home in the manner shown in Fig. 2, so as to securely clamp the disk between the washer j and the collar 77; The cross-bar by means of which the rod F may be conveniently turned. In this way the disk is firmly attached to the rod, and then the tapered lower end of the rod is passed through the g is then inserted and constitutes a handle 5 hole in the plate D, the collar it being made I00 to rest on the plate, while the edge of the disk rests on the outer ends of the radial arms and on the block B in the manner clearly shown in Fig. 2. It is understood, of course, that the disk or a portion thereof is heated before being placed on the anvil. The heated portion may then be drawn down or sharpened by hammers, the disk beingrturned by means of the rod F as the operation progresses. As often as required the edge of the disk is reheated without necessarily removing the disk from the rod. No matter how often the disk is removed and replaced its edge will always lie properly on the block B, and when the forging of the entire peripheral edge of the disk is completed it will be found to have a true and even bevel.

It is obvious that the device may be made and sold at small expense, may readily be applied to any anvil, and its use requires no particular skill. N0 adjustment is required, as the device accommodates itself to disks of various sizes.

block, curved radial arms attached to theouter end of the plate, a rod rotatably connected with the plate and providedvwith a collar near its lower end, and a pin or key for clamping a disk against the collar.

In testimony whereof I have hereunto subscribed my name.

TOBIAS MATTIAS ANDERSON.

"itnesses H. L. BLACK, E. L. Rosa 

